Regenerating the autotools configuration on Debian and Ubuntu systems
causes compilation to fail with this error message:
cmd/mount_zfs/../../cmd/mount_zfs/mount_zfs.c:403:
undefined reference to `is_selinux_enabled'
In the automake template, set "mount_zfs_LDFLAGS = ... $(LIBSELINUX)"
so that the /sbin/mount.zfs utility is linked to libselinux.
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>